Question

所以我有一张名为＆＃34; person＆＃34;在数据库test1中：

CREATE TABLE [dbo].[persons](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [LastName] [varchar](50) NULL,
    [FirstName] [varchar](50) NULL,
    [Job] [varchar](50) NULL,
    [Extension] [char](10) NULL,
    [EMail] [varchar](50) NULL,
    [Dept] [int] NULL,
    [MobileNumber] [char](10) NULL,
    [District] [int] NULL,
    [Status] [varchar](50) NULL,
    [InOutStatus] [varchar](5) NULL,
    [InOutDescr] [varchar](50) NULL,
    [InOutDirections] [varchar](255) NULL,
    [InOutReturn] [varchar](50) NULL,
    [login] [varchar](50) NULL,
    [StatusExpiry] [datetime] NULL
) ON [PRIMARY]

一张名为＆＃34; Users＆＃34;在数据库test2中：

CREATE TABLE [dbo].[Users](
    [User_ID] [int] NOT NULL,
    [Firstname] [nvarchar](50) NULL,
    [Lastname] [nvarchar](50) NULL,
    [Username] [nvarchar](50) NULL,
    [Status] [nvarchar](50) NULL
) ON [PRIMARY]

我尝试做的是创建一个触发器，如果更新了人员表中的FirstName，LastName，login和/或Status列，则会在Users的相同列中更新相同的值表。这是我提出的触发器，但它不起作用：

ALTER TRIGGER [dbo].[UserUpdteTrig]
   ON  [dbo].[persons]
   AFTER UPDATE
AS 
BEGIN
    DECLARE @uid int;
    DECLARE @fname nvarchar(50);
    DECLARE @lname nvarchar(50);
    DECLARE @uname nvarchar(50);
    DECLARE @stat nvarchar(50);


    SELECT @fname = i.FirstName, @lname = i.LastName, @uname = i.login, @stat = i.Status
    FROM inserted i

    UPDATE [test2].[dbo].[Users]
    SET Firstname = @fname , Lastname = @lname, Username = @uname, Status = @stat
    FROM [test2].[dbo].[Users] u INNER JOIN inserted i ON u.User_ID = i.ID

END

我不断收到一条错误消息：更新和删除的行值不会使行唯一或者它们会改变多行，这两个表中的PK都是唯一的，并且PK不应该被改变

Answer 1

你根本不需要任何变量，只需简单的更新即可。

ALTER TRIGGER [dbo].[UserUpdteTrig]
   ON  [dbo].[persons]
   AFTER UPDATE
AS 
BEGIN
 SET NOCOUNT ON;

     UPDATE u 
    SET u.Firstname = i.FirstName
      , u.Lastname  = i.Lastname
      , u.Username  = i.Username
      , u.[Status]  = i.[Status]
    FROM [test2].[dbo].[Users] u 
    INNER JOIN inserted i ON u.[User_ID] = i.ID


END

SQL触发器 - 如何在更新另一个数据库中的另一个表时更新表？

1 个答案: